Impression and cast retainer



ETAINER Oct. 16, I

W. M. GAMBILL IMPRESSION AND CAST R Filed Aug. 29. 1922 INI/ENTOR.

\ ATTORNEY.

Patented @et M5, i923;

unir-nn stares lai-lt stieg! WILLIAM M. GAMBILL, 0F MESI/(EL, TEXAS.

IIIPRESSION AND CAST RETAINER.

Application filed August 29, 19.22. Serial No. 584,982.

the cast `being producedfrom either the upper impression or the lower impression.

The invention has certain advantages over4` means heretofore employed. for similar purposesk in that the invention saves time 1n making the cast, does not cause a mess, saves material. mounts readily onan articulator,

fits lthe flask without trimming, eliminates bubbles from the cast, admits of vibration,

the material does not spread, gives a 4perfeet-ly smooth east and more dense than heref tofore` and makes the cast of any thickness desired'.

The invention comprises a flask adapted `to hold an impression tray with the handle inserted through a hole in a sheet of cloth used in connection with the cast retainer or flask.

In operating the cast retainer, the cloth is first immersed in water and squeezed to press out excess water. The handle of the impression tray is then inserted through the hole in the cloth and through a slot in the iask to reach to the exterior thereof. Then the impression tray is held in place by the index finger of the hand so as to engage against the bottom of the impression retainer. pulling the cloth evenly around the periphery of the cast retainer. After this, a rubber hand is placed about the periphery of the cloth at a ldistance of about one-half inch down the cast retainer. The handles of the impression tray and the cast retainer are held firmly together and the cloth is then pulled straight down all around the periphery of the cast retainer so as to get out all folds-of cloth. As soon as this is accomplished, the cast is run and is jarred continually until the desire-d fullness or density is accomplished. Whenthe casting material has hardened, the rubber band is removed and the cloth is pulled gently around Aupper impression is thatl described.

`the appended claims.y

the periphery of the'impression andcastv` retainer to remove the cast. f f

vThe procedure for making a cast of an For casting a lower impression, a horse shoe .shaped attachment is placed in the flask andl the procedure is then the same as for the upper impression. u

The invention will be best` understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming part` of this application, with the 'understanding that the invention is not conhned to any strict conformity with the showing of ther drawings'but may be changed 'and vmodified so long as such changes and modifications mark no material departurefrom the salient features of the :invention' In the drawings l Figure l is aplan View of sembled for casting.' f

Fig. 2 is an upright section on the line 2-2 of F ig. l. f

Fig. 3 is a cross section on the line 3 3 of Fig. 1.

Fig. l is a plan view of the flask.

Fig. 5 is a perspective view of a U-shaped form for location at the suction Zone of the cast. c

Referring to the drawings, there is shown a flask l in which there is lodged a dental. impression tray 2 provided with the customary handle 3 extending through a slot l in what constitutes the front wall of the flask and which handle 3 extends to the outside of the flask onto a ledge or handle 5 whereby the handle 3 maybe held against the handle 5 by the thumb andy Fingers of the human hand.

Placed upon the flask l is a cloth sheet 6 having a marginal drop extension 7 over the upper margin of the flask so as to produce a loop into which the casting material may be deposited.

When the parts are assembled to produce a cast, there is provided a horse-shoe shaped attachment which, when the cast retainer is as expressed in the I flask aslA p around the periphery ot' the cast-retainer.

lVhen this is accomplished, a rubber band is placed' around the cloth encirclingthe upper edge of the flask preferably at a distance of about onehalf inch below the upper edge. Now by holding the impression tray and the rast retainer irmly together by the `lingers oi the hand, the cloth is pulled straight dovvn all around the periphery of the cast retainer so asv to get out all the i folds of the cloth.

Having accomplished the assembly of the parts, the handles 3 and 5 are grasped and y the east is poured, the laskbeing jarred continually until the desired fullness is reached.

After the casting material has hardened, the rubber hand is removed and the cloth 6 is pulled gently all around the periphery oi the impression and east retainer and the parts are thereby removed.

The invention greatly facilitates the casting operation and therefore savestime and the presence of the cloth prevents any messing in the operation. The east mounts on the artieulator much easier than heretofore and no trimming is needed.

Besides all this7 the operation eliminates bubbles from the cast and therefore produces a perfectly smooth east with more density than heretofore. Moreover, the invention admits of vibration Without the material spreading and the cast is correspondingly compacted and made more dense.

What is claimed is:

l. A cast retainer for dental purposes, ot a depth to receive a dental impression tray, With the retainer having a handle, said cast retainer also having a slot through the upright Wall adjacent to the handle to pass the handle of the impression tray, and a fabric sheet With a slot therethrough to pass y the impression tray handle.

2. A cast retainer for dental purposes, oi a depth to receive a dental impression tray, with the retainer having a handle. said cast retainer also having a slot through the upright Wall adjacent to the handle to pass the handle oi the impression tray, and a cloth sheet with a slot therethrough for the impression tray handle.y said cast-retainer having associated therewith a U-shaped mem-- ber to support the cloth at a height to lorm the suction cavity. L

In testimony whereof, I affix my signature hereto.

WILLIAM M. GAMBILL. 

